/* a fast and simple context switching library */
-/* Copyright (c) 2009 - 2011. The SimGrid Team.
+/* Copyright (c) 2009-2013. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include "xbt/log.h"
#include "xbt/swag.h"
#include "xbt/xbt_os_thread.h"
-#include "src/simix/private.h"
-#include "simix/context.h"
-#include "gras_config.h"
+#include "smx_private.h"
+#include "simgrid/sg_config.h"
+#include "internal_config.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
- "Context switching mecanism");
+ "Context switching mechanism");
char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */
smx_ctx_factory_initializer_t smx_factory_initializer_to_use = NULL;
int smx_context_stack_size = 128 * 1024;
-
+int smx_context_stack_size_was_set = 0;
#ifdef HAVE_THREAD_LOCAL_STORAGE
static __thread smx_context_t smx_current_context_parallel;
#else
static smx_context_t smx_current_context_serial;
static int smx_parallel_contexts = 1;
static int smx_parallel_threshold = 2;
+static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAULT;
/**
* This function is called by SIMIX_global_init() to initialize the context module.
*/
void SIMIX_context_mod_init(void)
{
+#if defined(CONTEXT_THREADS) && !defined(HAVE_THREAD_LOCAL_STORAGE)
+ /* the __thread storage class is not available on this platform:
+ * use getspecific/setspecific instead to store the current context in each thread */
+ xbt_os_thread_key_create(&smx_current_context_key);
+#endif
if (!simix_global->context_factory) {
/* select the context factory to use to create the contexts */
if (smx_factory_initializer_to_use) {
}
else { /* use the factory specified by --cfg=contexts/factory:value */
- if (smx_context_factory_name == NULL) {
- /* use the default factory */
- #ifdef HAVE_RAWCTX
- SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
- #elif CONTEXT_UCONTEXT
- SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
- #else
- SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
- #endif
- }
- else if (!strcmp(smx_context_factory_name, "ucontext")) {
- /* use ucontext */
+
+ if (!strcmp(smx_context_factory_name, "thread")) {
+ /* use os threads (either pthreads or windows ones) */
+ SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
+ }
#ifdef CONTEXT_UCONTEXT
+ else if (!strcmp(smx_context_factory_name, "ucontext")) {
+ /* use ucontext */
SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
-#else
- xbt_die("The context factory 'ucontext' unavailable on your system");
-#endif
- }
- else if (!strcmp(smx_context_factory_name, "thread")) {
- /* use os threads (either pthreads or windows ones) */
- SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
}
+#endif
+#ifdef HAVE_RAWCTX
else if (!strcmp(smx_context_factory_name, "raw")) {
- /* use raw contexts */
- SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
+ /* use raw contexts */
+ SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
}
+#endif
else {
XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
#ifdef HAVE_RAWCTX
}
}
}
-
-#if defined(CONTEXT_THREADS) && !defined(HAVE_THREAD_LOCAL_STORAGE)
- /* the __thread storage class is not available on this platform:
- * use getspecific/setspecific instead to store the current context in each thread */
- xbt_os_thread_key_create(&smx_current_context_key);
-#endif
}
/**
- * This function is call by SIMIX_clean() to finalize the context module.
+ * This function is called by SIMIX_clean() to finalize the context module.
*/
void SIMIX_context_mod_exit(void)
{
finalize_factory = simix_global->context_factory->finalize;
finalize_factory(&simix_global->context_factory);
}
- xbt_dict_remove((xbt_dict_t) _surf_cfg_set,"contexts/factory");
+ xbt_dict_remove((xbt_dict_t) _sg_cfg_set,"contexts/factory");
}
/**
* for the user contexts.
*
* This function should be called before initializing SIMIX.
- * A value of 1 means no parallelism.
+ * A value of 1 means no parallelism (1 thread only).
* If the value is greater than 1, the thread support must be enabled.
*
* \param nb_threads the number of threads to use
*/
XBT_INLINE void SIMIX_context_set_nthreads(int nb_threads) {
-
- xbt_assert(nb_threads > 0, "Invalid number of parallel threads: %d", nb_threads);
-
+ if (nb_threads<=0) {
+ nb_threads = xbt_os_get_numcores();
+ XBT_INFO("Auto-setting contexts/nthreads to %d",nb_threads);
+ }
+
if (nb_threads > 1) {
#ifndef CONTEXT_THREADS
THROWF(arg_error, 0, "The thread factory cannot be run in parallel");
#endif
}
-
smx_parallel_contexts = nb_threads;
}
* \return how threads are synchronized if processes are run in parallel
*/
XBT_INLINE e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode(void) {
- e_xbt_parmap_mode_t mode = XBT_PARMAP_FUTEX;
- const char* mode_name = xbt_cfg_get_string(_surf_cfg_set, "contexts/synchro");
- if (!strcmp(mode_name, "posix")) {
- mode = XBT_PARMAP_POSIX;
- }
- else if (!strcmp(mode_name, "futex")) {
- mode = XBT_PARMAP_FUTEX;
- }
- else if (!strcmp(mode_name, "busy_wait")) {
- mode = XBT_PARMAP_BUSY_WAIT;
- }
- else {
- XBT_WARN("Command line setting of the parallel synchronization mode should "
- "be one of \"posix\", \"futex\" or \"busy_wait\"");
- }
- return mode;
+ return smx_parallel_synchronization_mode;
}
/**
* \param mode how to synchronize threads if processes are run in parallel
*/
XBT_INLINE void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) {
- if (mode == XBT_PARMAP_POSIX) {
- xbt_cfg_set_string(_surf_cfg_set, "contexts/synchro", "posix");
- }
- else if (mode == XBT_PARMAP_FUTEX) {
- xbt_cfg_set_string(_surf_cfg_set, "contexts/synchro", "futex");
- }
- else if (XBT_PARMAP_BUSY_WAIT) {
- xbt_cfg_set_string(_surf_cfg_set, "contexts/synchro", "busy_wait");
- }
- else {
- XBT_WARN("Command line setting of the parallel synchronization mode should "
- "be one of \"posix\", \"futex\" or \"busy_wait\"");
- }
+ smx_parallel_synchronization_mode = mode;
}
/**
